R1:6983479e4f60

Allow "almanac.service.edit" to create services

Summary:
Depends on D19317. Ref T13120. Ref T12414. See PHI145. See PHI473.

This adds a Conduit-only "type" transaction for Almanac services. This is very similar to the approach in D18849 for Drydock blueprints.

Test Plan:
- Tried to create an empty service via "almanac.service.edit", was told to pick a type.
- Tried to pick a bad type, was told to pick a good type.
- Created a new Almanac service via "almanac.service.edit".
- Tried to edit the…